In the grand scheme of things a '69 lens is not all that old.
I have seen, however, fungal fogging in younger lenses.
On the front lens it is usually not too difficult to get
at, usually. I am not sure why you can't get at it.
Do you have a lens 'spanner'? This is a gadget that fits
into the slots at the sides of the retaining ring holding it in place.

If there is a dress ring in front of the retaining ring you will
have to screw it out first with a rubber ring and block of (say)
wood, or whatever. After this all is straightforward. It's a
friction fit.

I use an old pair of fine scissors to screw out the ring - CAREFULLY!
Don't slip and scratch the lens! Adjust the points to fit the slots and
hold it firm and twist.

The fog may just wash off with alcohol (Metho) and a blast
of canned gas (DSE). If it is fungus, google a cure - I believe
household ammonia works OK but you're on your own there!

Zoom lenses are a bit of a headache. I've got one with the
same symptoms but it is the 3rd layer down and I'm unable
to go that deep. I sympathise. Complete dissasembly is
a job for experts and not one for the tyro.

See how you go.
Murray
Brisbane




Gordon W wrote:

I have an old (1969) Elmo FP-C super8 movie projector with a fogged lens. It is
the first lens in the zoom lens. I can get at it but can't unscrew it to get to
the fogged side. I've tried numerous repair places and clubs here in OZ but
nobody touches these things anymore.
If somebody could give me a clue or suggest a more appropriate group I would
appreciate it.
Thank you

Gordon